Deckle-strap.



nierfmaehinesthat these portions of the "pulp-bearing'wire at and adjacent lto the UNITED STATES PATENT OFFICE.-

. f MARBIVJE D; or.riotroun'MASSACHUSETTS.

neemt-STRAP,

srncrricarron fomiig part ef Lettersratent No. 653,245, aatauuiy 1o, 1900; Application iiie'a November 23, 1899. sei-iai No. 738.05m (No man To ctZZ whom zit may concern: l `Be it known that I, MARBLE D. KEENEY, a

' citizen of thenniteu states, residiiigai Het yoke', in theeounty'of Hampden 'and-State of Massachusetts, haveinvented new and useful Improvements in Decirle-Straps, of .which the following isa specification." e

My invention relates to the i deekle-str'aps of Fourdrinier paper-.making Imt is Well known to users ofthe Fourdrii edges which are arranged beneath the'deeklef f ofthei'wiire and-thus renderjthesame worthrstraps` wear` lout `long before the i remainder vless 'as a Whole.` Thisexeessive w'earof the portions of the wire beneaththedeeilestraps is diie tothefactfthat' the' operator,

lhaving nowayof aseertaihingthe position of the usual adjustable heads of a suction-box l.with respect to the'deekleLstiaps, plaefes said heads at any point intermediate ofthe edges `pf. thestraps, with the resultthat theinner pox-tions'of the straps are subjeetedz to ille suction in the boxand caused topress the` i portions of wire-beneath theinagainst the .tions of the wireandrboix. l.50 e i e provide deelde-straps which are soonstrueb" ellas torender it impossible for the operator box and create friction between w The: general object ofmy'inve'i ion to of a Fourdrin-ier machine to seal thegsuetion-box withoutpl'aeingthe adj ustab'lejheads below the inner-u portions of the deelde-straps and at the opposite edgesV of the sheet'of per being made, in which position said heads will eectually prevent the suction in the box from drawing'any portion of the decirlestraps towardthe box and causing the excessive Wear of wire; and box above stated.

Another object is to provide deelde-straps which are construe-ted with a view `oi notify-` ing the operator `'when the adjustable heads willvbe fully understood from the following deeliles oi" Said porto illustrate one of the adjustable heads of the suction-box.` ig. 2`is an' enlarged transverse section of one of. the deeklestraps. FigQB is 'an enlarged transverse section of a modified form of deelde-strap; Fig. 4 is a detail inverted perspective viewof another i modified form' of decirle-strap. Fig; 5 is a detail inverted perspective View of still anotherffinodiied form of deelde-strap. Y

Referring by letter to the said drawings,

and moi'efpariieularlyto Figs. l'and 2 there- 01","Ais'a stationary suction-box forming part `of aFourdrinierpaper-making machine., The `said box is previded with-a foraminated upperwall or cover` a and contains heads b, of rubberen other suitable material, adjustable lengthwise of` the box Vthrough the medium of handles eafter the usual well-known manner. i. `B is a pulp-bearing wire or wire-cloth which is' arranged, as shown by dotted `Lines, to pass over theforaininated upper lwall of the suctionfbox in the ordinary manner.

C C arel' my `improved deokle-s`tr`aps, the

'saine being made of rubber orother suitable 'material and heavy that they may bear closely uponthe surface of AWire B and prevent any i l pulp from passing beneath them. They differ from the ordinary decirle-straps at pres ent :in use in that they are provided at intervals in their lengthwith duets D in the form of apertures, which extend from their lower to' their upper sides, as shown in Fig. 2. These apertures are preferably arranged in lines adj aeent to the inner' edges of the straps,

as shown, and vthey have for their purpose to admit air. to the underside of the straps as the same pass over the suction-box.4

Inipractice after the deelde-straps are arranged at the-desired distance apart on the wire B the heads b in the suction'lbox A are adjusted until they rest in alinernentore incident with the linesof apertures D in the straps C. 'When the heads b are thus placed, the whistling, due to thev drawing of air through the apertures D, will cease, and the operator will thereby be apprised of the fact lthat the heads are in proper position to seal the suction-box. lIt will also be observed that by virtue of the apertures D in the straps C the suction-box cannot be sealed until the heads bare in their proper position-1 2. e., in

alinement or coincidentwith the lines of apertures in the straps C-and that when the heads b are in such position no part of theA `deckle-straps is subject to the suction in the box, and henceis not drawn toward the box and caused to create frictional wear between the pulp-bearing wire and thebox. I prefer to provide the straps C with apertures D .for the purpose of admitting air beneath them when said? apertures are not sea-led by the heads b, but do not desire to be understood as confining myself'to the use of apertures, as ducts D in the form of channels, such as shown in Fig. 3, may be employedin lieu of the same. These channels D' are formed in theunder side of the straps at suitable intervals and extend transversely from the outer edges thereof to a point adjacent to the inner edges.

In Fig. 4 areshown ducts D2 in the form of channels, which are similar to the channels` ,D' of Fig.'3, except that they are disposed oblique of the straps.

The ducts D3 (shown in Fig. 5) are in the form of channels which are disposed lengthwise of the straps and are adapted when one of their ends is over the 'suction-box to ad- Amit air beneath the -straps through their-exposed portions in advance or in rear of the box.

It will be. readilyobserved that straps cons tructed after the manner shownin Figs. 3 to 5 will operate equally as well as theY straps shown in Figs. l and 2 to apprise the oper-l ator when the heads b of the suction-box are incorrectly adjusted with reference vto the straps and the width of the sheet of paper to be made. It willr also -be observed that deckle-straps embodying my invention may be made almost, if not quite, as cheaply as the ordinary deckle-straps such as at present in general use.

Having thus described my invention, what l claim isl. An improved deckle or deckle-strap for paper-making machines provided with mean: for admitting air to its under side as it passes over the suction-box of a machine.

2. An improved deckle or deckle-strap for paper-making machines provided with a duct for admitting air toits under side as it passes over the suction-box of a machine, substantially as specified.

3. An `improved deckle o'r deckle-strap for papermiaking machines provided, at inter- Vals in its length, with ducts for admitting air to its under side as it passesover the suctionbox of a machine, substantially as specified.

4. An improved deckle or deckleLstrap for paper-making machines provided, at intervals in its length, with apertures extending from its lower to its upper side; the said apertures being designed to admit air to the lower side-of the strap as the same passes over the suction-box of a machine, substantially as specified.

5. ln' a paper-making machine, the` combination of` a suction-box, an adjustable head therein, and a deckle or deckle-strap provided with a duct for admitting air toy its under side as it passes over the suction-box; said duct v having its discharge arranged adjacent to the,

nesses. v

, v MARBLE D. KEENEY. lViftnesses:

FRED G. ALLEN, Round. BARDWELL.

, y the combi- 

